j 

Photographic 
Lenses, 

Shutters, 
Prisms. 

$  attach  &  $mb 
optical  Co. 


The  Cummins  Photo  Stock  Co. 
106  N.  Charles  Street, 

BALTIHORE,  MD. 


Bausch  &  Lomb 
Optical  Co., 


MANUFACTURERS  OF 


PHOTOGRAPHIC 

LENSES, 

SHUTTERS, 

PRISMS,  ETC. 


BRANCH  OFFICE  AND  WAREROOMS 
130  Fulton  Street, 
NEW  YORK  CITY 
P.  O.  Box  432. 


FACTORY  AND  MAIN  OFFICE: 
515-543  North  St.  Paul  Street, 
ROCHESTER,  N.  Y. 
P.  O.  Drawer  1033. 


SEVENTH  EDITION. 

June,  1894. 


E.  R.  ANDREWS,  PUBLISHER, 
I  AQUEDUCT  STREET, 
ROCHESTER,  N.  Y. 


PREFACE. 


With  this  issue  we 

HAVE  MADE  AND  SOLD  33,000  LENSES. 

This  enormous  increase  in  the  demand  of  our  lenses  by  professional  and 
amateur  photographers  requires  no  words  to  show  their  general  and  increasing 
popularity.  We  shall  continue  in  the  future,  as  we  have  in  the  past,  to  make  our 
work  the  synonym  of  the  highest  quality  and  absolute  regularity,  and  utilize  every 
opportunity  to  make  improvements. 

We  introduce  herewith 

TWO  NEW  SERIES  OF  PORTRAIT  LENSES, 

which  possess  unusual  merit  and  to  which  we  call  the  special  attention  of  profes- 
sional photographers. 

We  have  also  received  the  computations  and  material  for 

A  NEW  SERIES  OF  ZEISS-ANASTIGMAT  LENSES, 

which  will  be  particularly  interesting  to  the  amateur  and  view  photographer. 
At  the  same  time  a  very  material 

REDUCTION  IN  PRICES  OF  THE  ZEISS-ANASTIGMATS 

will  take  effect.  We  are  particularly  pleased  to  make  this  announcement,  since, 
with  all  the  advantages  which  these  lenses  possess^  many  who  have  appreciated 
and  been  desirous  of  possessing  one  or  the  other,  have  been  deterred  from  doing 
so  by  the  comparatively  high  prices.  We  have  made  strenuous  efforts  to  change 
this  condition,  believing  that  their  great  popularity  will  be  considerably  enhanced. 
We  call  particular  attention  to  their  various  advantages  in  the  pages  devoted  to 
them. 

We  introduce  herewith  a  new  series  of 

IMPROVED  IRIS  DIAPHRAGMS, 

which  are  now  attached  to  all  of  our  lenses  excepting  Velox  Series  at 

NO  ADVANCE  IN  PRICE, 

except  the  Rapid  Universal  and  A.  G.  Clark,  in  which,  however,  it  is  very  slight. 
We  also  introduce  herewith  our  new 

TELE-PHOTO  LENSES, 

which  we  commend  for  practicability  and  moderate  prices. 
We  also  offer  our 

STEREOSCOPIC  SHUTTER, 

which  has  proven  very  satisfactory  in  its  work,  and  which,  now  that  stereoscopic 
photography  is  becoming  more  popular,  will  be  welcomed  as  an  effective  aid. 

Any  of  our  lenses  will  be  cheerfully  sent  to  responsible  parties  for  exam- 
ination and  comparison. 

Bausch  &  Lomb  Optical  Co. 

June,  1894. 


4 


BAUSCH  &  LOMB   OPTICAL  COMPANY, 


THE  goods  enumerated  in  this  Catalogue  can  be  obtained  from 
any  of  the  Photographic  Stock  Dealers  in  this  country  and  in 
Canada.  In  cases  where  there  is  any  difficulty  in  so  obtaining,  we 
will  be  pleased  to  supply  direct  at  Catalogue  Prices. 

They  may  also  be  obtained  in  foreign  countries  from  the  follow- 
ing prominent  firms,  who  are  our  representatives  for  their  respective 
countries. 


CHARLES,  REYNOLDS  &  CO  , 

London,  England. 

N.  FELLHEIMER, 

-    Stuttgart,  Germany. 

CARL  ZEISS, 

-    Jena,  Germany. 

CLEMENT  &  .  GILMER, 

Paris,  France. 

KARL  FRITSCH, 

Vienna,  Austria. 

L.  VAN  NECK  &  CO., 

Antwerp,  Belgium. 

F.  KORISTKA, 

Milano,  Italy. 

0.    DIRADOUR,  .... 

Constantinople,  Turkey. 

J.    LEWELLYN  &.  CO., 

Shanghai,  China. 

COCKING  &  CO., 

Yokohama,  Japan. 

HOLLISTER  DRUG  CO.,  LIMITED, 

Honolulu,  Hawaian  1st. 

JULIO  LABADIE,  Suc'rs  y  Cia, 

Mexico  City,  Mexico. 

CURTIS  BROTHERS, 

Dublin,  Ireland. 

We  also  issue  a  very  complete  List  of  Microscopes, 
Objectives,  and  Accessories,  which  we  will  be  pleased 
to  forward  to  any  person  interested  in  Microscopy. 


ROCHESTER,   N.  Y.,  AND  NEW  YORK  CITY. 


5 


SELECTION  OF  LENSES. 


To  select  a  lens,  suitable  for  certain  purposes,  is  a  matter  of  considerable 
difficulty,  even  for  a  person  adept  in  photography,  and  we  are  sure  that  a  few 
words  from  us,  which  will  aid  in  making  proper  selections,  will  not  be  found 
amiss. 

There  are  such  a  variety  of  claims  made  for  different  lenses,  that  we  are  not 
surprised  to  receive  so  many  inquiries  as  to  the  various  conditions  involved. 

While  results  in  photography  depend  to  a  great  extent  upon  personal  skill 
and  experience,  the  basis  of  all  good  work  is  always  the  lens.  The  camera  may 
be  more  or  less  crude,  and  its  adjuncts  as  well,  but  that  part  of  it  which  gives 
the  photographic  image,  the  lens,  should  be  of  as  high  grade  as  possible,  so  as 
to  give  a  correct  representation  of  what  it  is  desired  to  retain  in  the  form  of 
a  picture.  From  lack  of  a  true  understanding  of  the  subject,  many  persons 
endeavor  to  economize  by  purchasing  a  cheap  and  in  many  cases  a  useless  lens, 
unmindful  of  the  fact  that  instead  of  acquiring  what  will  always  be  a  source  of 
pleasure,  they  are  burdening  themselves  with  what  will  be  a  continual  cause  of 
annoyance  and  dissatisfaction.  The  outcome  is,  that  such  lenses  are  almost 
always  discarded  and  become  a  loss,  while  others  of  known  reliability  are  pur- 
chased. In  other  cases  lenses  are  purchased  wholly  unsuited  to  the  purpose  t© 
which  they  are  put,  with  usually  the  same  result. 

Achromatism  is  the  first  condition  in  a  good  objective.  It  is  that  quality 
which  brings  the  chemical  rays,  or  those  which  produce  the  photographic  image, 
in  exact  coincidence  with  visual  rays,  or  those  which  make  the  image  apparent  to 
the  eye  on  the  ground  glass.  A  slight  deviation  from  perfect  achromatism  will 
produce  the  photographic  image  either  in  front  or  behind  the  plate  and  will 
therefore  cause  indistinctness.  This  may  sometimes  be  partially  corrected  by  the 
use  of  small  stops,  but  when  it  exists  it  is  always  a  serious  fault. 

Angle  of  View  depends  upon  the  proportion  of  focal  length  to  the  size  of 
plate  and  is  expressed  by  the  angle  formed  by  the  extreme  rays  forming  the 
image.  Lenses  of  the  rectilinear  type  have  an  angular  aperture  varying  from 
400  to  700.  Those  giving  an  angle  of  from  850  to  no°  are  termed  Wide  Angle. 
Owing  to  the  large  apertures  of  the  lenses  in  the  ordinary  types  of  these  latter, 
and  their  inability  to  combine  the  rays  on  the  edges  of  the  plate,  it  is  usually 
necessary  to  use  them  with  small  stops  to  obtain  good  results.  This  involves 
another  quality. 


6 


BAUSCH  &  LOMB  OPTICAL  COMPANY, 


Speed  or  Rapidity. — It  represents  the  quality  of  forming  a  correct  image  within 
a  given  time,  and  depends  upon  the  proportion  of  working  aperture  to  length 
of  focus.  In  addition  it  depends  upon  the  quality  of  the  lens  in  design  and 
mechanical  execution,  and  is  the  principal  feature  in  determining  the  quality  of  a 
lens  from  an  optical  standpoint,  providing  its  other  qualities  are  of  corresponding 
perfection.  At  this  day,  when  instantaneous  photography  is  so  generally  practiced, 
it  is  of  the  greatest  importance,  not  only  as  a  quality  in  itself,  but  of  the  ability 
of  the  lens  to  give  with  it  a  sharp,  clearly  defined  picture.  While  the  rapidity 
of  a  lens  depends  to  some  extent  upon  its  angle,  the  aperture  through  which  the 
light  passes,  or  the  size  of  the  stop,  determines  it.  The  speed  decreases  propor- 
tionately with  the  decrease  in  the  size  of  stop.  In  this  regard  the  recommen- 
dation of  the  English  society  is  now  generally  followed,  by  which  each  succeeding 
smaller  stop  requires  double  the  exposure  of  the  preceding.  By  this  system  the 
stops  are  designated,  8,  16,  32,  etc.,  but  their  relative  value  to  focal  length 
is  also  used.  The  f-8  is  one-eight  of  the  equivalent  focal  length  and  really 
expresses  the  value  of  the  speed.  From  this  it  will  be  seen  that  the  focal  length 
is  as  great  a  factor  as  the  aperture. 

Depth  of  Focus  is  another  important  quality  and  represents  the  degree  of 
sharpness  with  which  objects  lying  at  different  distances  in  front  of  the  camera 
are  shown  at  the  same  time  on  the  plate.  It  depends  upon  the  focal  length, 
angle  of  view  and  working  aperture,  and  increases  with  the  decrease  of  these 
three  factors.  As  can  easily  be  determined  by  experiment,  an  object  close  to  the 
camera  will  be  found  to  have  a  longer  posterior  focus  than  one  at  a  distance  and 
no  lens  can  ever  be  constructed,  which  with  full  aperture  will  bring  the  two  in 
one  plane,  so  that  the  advertised  claims,  which  are  made  for  a  large  number  of 
lenses,  of  great  speed  with  great  depth  of  focus  may  be  put  down  as  false.  The 
extent  to  which  a  lens  possesses  speed  and  depth  of  focus  is  variable,  however, 
and  depends  upon  the  skill  of  the  optician,  but  it  may  be  added  that  under  the 
same  conditions,  the  depth  increases  with  the  decrease  in  focus,  as  there  is  less 
variation  between  the  different  planes  at  the  back  for  the  different  distances  at 
the  front  of  the  lens.  For  this  reason  it  is,  that  only  short  focus  lenses  can  have 
approximately  a  "  Universal  focus."  If  plates  could  be  constructed  of  such 
sensitiveness  as  to  admit  the  use  of  small  apertures,  depth  of  focus  would  be  the 
result  to  a  much  higher  degree,  but  this  attainment  depends  upon  the  chemist 
and  not  the  optician.  A  lens  may  be  made  to  have  approximately  a  universa  lfocus 
for  a  3^  x      inch  plate,  and  even  4x5  inch  plate,  but  here  it  ceases. 

Flatness  is  the  quality  of  defining  an  object  equally  well  upon  the  entire 
surface  of  the  plate,  but  can  never  be  wholly  accomplished  because  in  the  nature 
of  things  there  is  a  certain  amount  of  curvature.  It  depends  upon  the  angle, 
aperture  and  focus,  but  after  these  conditions  entirely  upon  the  skill  of  the 


ROCHESTER,   N.  Y.,  AND  NEW  YORK  CITY. 


7 


optician,  and  in  this  respect  probably  the  greatest  difference  is  apparent  in  lenses 
coming  from  the  hands  of  different  manufacturers.  With  many  lenses  it  is  found 
necessary  to  use  one  intended  for  a  certain  plate  on  one  or  two  sizes  smaller  to 
obtain  satisfactory  results. 

Definition  is  the  capacity  to  concentrate  the  rays  to  one  point  so  as  to  give  a 
sharp,  clearly  denned  image.  It  is  of  the  greatest  importance,  as  it  shows 
principally  the  amount  of  care  which  has  been  devoted  to  the  lens  during  its 
construction.  Any  lens  not  having  this  property  in  the  highest  degree  may  be 
put  down  at  once  as  of  inferior  quality.  The  fault  is  overcome,  only  partially 
however,  by  reducing  the  aperture,  but  this  is  of  course,  at  the  sacrifice  of  speed. 
When  due  to  non-achromatism  it  may  be  determined  by  observing  whether  the 
visual  image  is  sharp,  and  chemical  image  or  photograph  indistinct,  although  in 
this  case  great  care  should  be  observed  that  the  ground  glass  and  plate  are 
in  exact  coincidence,  which  very  often  is  not  the  case.  When  due  to  faulty 
construction  or  workmanship,  it  can  easily  be  determined  by  observing  the  image 
on  the  ground  glass.  The  image  should  be  an  exact  representation  of  the  real 
object  in  detail  and  should  be  determined  by  the  aid  of  a  magnifier  or 
focusing  glass. 

Testing  lenses  is  a  matter  of  no  small  importance,  and  should  be  done  with 
the  greatest  care  and  regard  to  the  points  mentioned  above.  As  speed,  depth 
and  flatness  are  varying  qualities  in  different  lenses,  we  emphatically  recommend 
that  they  be  not  judged  in  a  lens  by  themselves,  but  in  comparison  with  another 
lens  of  about  the  same  proportion,  preferably  with  one  of  known  excellence.  A 
person  well  experienced  in  photography  may  be  able  to  form  a  correct  judgment, 
but  one  who  is  not,  cannot  do  so  with  security.  Care  should  be  taken  that 
comparisons  be  made  under  the  same  conditions  as  to  light,  size  of  stop  and  time 
of  exposure,  and  if  indefinite,  should  be  repeated. 


TEST-CHART. 


The  above  is  a  reduced  fac-simile  of  our  Test  Chart  (16  x  48  inches)  which 
we  send  with  each  one  of  our  lenses.  We  appreciate  the  value  of  the  ability 
of  the  purchaser  of  a  lens  to  convince  himself  of  its  perfection,  and  put  the 
means  in  his  hands  of  making  comparisons  with  lenses  of  different  makers. 


s 


BAUSCH  &  LOMB   OPTICAL  COMPANY, 


UNIVERSAL  PORTRAIT  LENSES. 


Series  A. 


(Cut  i  size  No.  3.) 


QUICK  WORKING  LENSES  FOR  GENERAL  PORTRAIT  WORK. 

Although  these  lenses  have  been  in  use  in  the  hands  of  some  of  our  best 
known  photographers  for  the  purpose  of  testing  their  particular  qualities,  they 
are  herewith  introduced  for  the  first  time  to  the  general  public.  The  general 
commendations  of  their  high  qualities  convince  us  that  after  these  become 
more  generally  known  they  will  be  the  means  of  making  these  the  leading 
lenses  with  professional  photographers.  They  are  quick  working  and  have  an 
unusual  delicacy  of  definition,  freedom  from  distortion,  and  even  illumination. 
They  are  at  least  equal  to  the  lenses  of  the  best 'European  makers  intended 
for  the  same  work,  and  are  very  materially  lower  in  price  than  any  of  these. 

The  No.  3  of  this  series  is  recommended  as  the  most  useful  lens  for  cabinet 
and  whole-plate  work  in  the  studio. 

They  are  Supplied  only  with  our  Improved  Iris  Diaphragm. 


No. 

Size.  » 

Diameter  of  Lenses. 

Back  Focus. 

Price. 

Telegraphic  Code. 

1 

4x5 

2f  in. 

6i  in. 

$  65.00 

Uberty. 

2 

5x8 

8*  " 

90.00 

Udal. 

3 

6£x  8£ 

H  " 

Hi  " 

135.00 

Udaler. 

4 

8  x  10 

4  " 

13*  " 

190.00 

Udder. 

ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


9 


EXTRA  RAPID  UNIVERSAL  LENSES. 

Series  D.  F-6. 


Cut  full  size  No.  00. 


FOR  HEADS,  GROUPS,  FIGURES  AND  OUTDOOR  WORK  OF 

GREAT  SPEED. 

The  larger  lenses  of  this  series  will  be  welcomed  as  portrait  lenses  par 
excellence,  having  unusually  delicate  definition  with  uniform  illumination,  good 
depth  and  speed  in  all  ordinarily  lighted  studios.  It  is  rare  that  a  lens  which 
is  designed  to  do  good  portrait  work  is  suited  for  good  landscape  work  as  well, 
but  these  qualities  are  combined  to  an  unusual  degree  in  these  lenses.  The 
lower  numbers  are  designed  for  very  quick  hand  camera  work,  giving  even 
illumination  and  possessing  perfect  definition.  The  mountings  are  compara- 
tively short,  which  overcomes  to  a  considerable  extent  the  inherent  astigmatism 
in  lenses  of  similar  construction.  These  lenses  may  be  had  with  or  without 
hood,  but  will  be  supplied  with  hood  unless  otherwise  ordered. 

By  unscrewing  the  front  combination  the  back  only  may  be  used,  giving 
about  twice  the  focus  with  about  one  half  the  speed. 

These  lenses  have  an  angle  of  70  degrees. 


They  are  Supplied  only  with  our  Improved  Iris  Diaphragm. 


Brass 

Aluminum 

No. 

Size. 

Diameter  of 
Lenses. 

Equivalent 
Focus. 

Back  Focus. 

Mounting. 

Telegraphic 
Code. 

Price. 

Price. 

0 

3±x  4i 

1  in. 

4f  in. 

31f  in. 

$  24.00 

$  27.00 

Ukase. 

00 

4x5 

n  " 

6f  " 

57- :: 

28.00 

32.00 

Ulaus. 

1 

5x8 

i+  " 

8  " 

36.00 

40.00 

Ulcer. 

2 

6£x  8* 

if  " 

» A  " 

8i  " 

46.00 

50.00 

Ulema. 

3 

8  xlO 

2i  " 

iii  - 

m " 

58.00 

64.00 

Ulnim. 

4 

10  x  12 

H  " 

14i  " 

12TV  " 

75.00 

82.00 

Ulnage. 

5 

1Z.  xl5 

3  A  " 

m  M 

I5i  « 

100.00 

108.00 

Umbel. 

6 

16  x20 

34  " 

22£  " 

m  " 

130.00 

139.00 

Umber. 

Telegraphic  code  refers  to  lenses  in  brass  mounting  ;  if  desired  in  aluminum  it  should  be  so  stated. 


1  o 


BAUSCH  &  LOMB   OPTICAL  COMPANY, 


RAPID  UNIVERSAL  LENSES. 


F.  8. 


Cut  full  size  No.  5. 


FOR  INSTANTANEOUS  OUTDOOR  WORK,  GROUPS  AND 
STANDING  FIGURES. 

These  lenses  have  enjoyed  an  unusual  popularity  since  their  first  introduction. 
They  are  of  the  rectilinear,  symmetrical  type  and  have  a  construction  peculiarly 
their  own.  The  glass  is  specially  manufactured  of  unusual  hardness  and  brilliancy, 
involving  specially  favorable  curves.  While  these  lenses  do  not  have  the  speed  of 
the  Extra  Rapid  Series,  they  give  excellent  results  in  a  well  lighted  studio  on 
groups,  figures  and  large  heads  having  great  depth  and  covering  capacity. 

For  outdoor  work  they  have  an  unusual  crispness  of  definition  with  full 
opening  and  great  covering  capacity  and  depth.  The  speed  is  ample  for  all 
ordinary  instantaneous  work  without  sunlight.  While  it  may  be  used  on  archi- 
tectural subjects  and  interiors,  a  wide  angle  lens  is  recommended  for  this  purpose. 
The  back  combination  may  be  used  with  good  results  on  twice  the  size  of  plate 
with  about  one-half  the  speed.  These  lenses  vary  in  angle  from  70  degrees  in  the 
smaller  to  60  degrees  in  the  larger  sizes. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 


They  are  Supplied  only  with  our  Improved  Iris  Diaphragm. 

Waterhouse  stops  in  place  of  Iris  at  the  same  prices. 


Brass 

Aluminum 

No. 

Large  Stop 
Covers. 

Diameter  of 
Image  Circle. 

Diameter  of 
Lenses. 

Back  Focus. 

Equivalent 
Focus. 

Mounting. 

Telegraphic 
Code. 

Price. 

Price. 

4i 

8  in. 

i  in. 

4f  in. 

5i  in. 

$  18.00 

$  21.00 

Ucubis. 

5 

4x5 

9i  " 

5f  " 

6f  " 

22.00 

25.00 

Umbria. 

8 

5x8 

11  " 

1-f  " 

7f  " 

81  " 

26.00 

30.00 

Unca. 

8i 

.  6^x  8£ 

13*  " 

If  " 

10f  " 

llf  " 

35.00 

39.00 

Unelli. 

10 

8  xlO 

16f  " 

a  << 

12*  " 

13|  V 

48.00 

52.00 

Upis. 

12 

10  x  12 

20  " 

2i  " 

15  " 

17  " 

60.00 

66.00 

Uraca. 

15 

12  x  15 

21*  " 

2f  ■« 

18  " 

20i  " 

75.00 

82.00 

Uxantis. 

18 

16  xl8 

27i  " 

3i  " 

22±  " 

24f  " 

95.00 

108.00 

Utica. 

22 

20  x22 

36  " 

4*  " 

28  " 

31f  " 

125.00 

139.00 

Uzita. 

Telegraphic  code  refers  to  lenses  in  brass  mounting ;  if  desired  in  aluminum  it  should  be  so  stated. 


ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


ALVAN  G.  CLARK  LENSES. 


F.  8. 


Cut  full  size  No.  5. 


FOR  INSTANTANEOUS  OUTDOOR  WORKGROUPS,  STANDING 
FIGURES,  INTERIORS  AND  ARCHITECTURE. 

These  lenses  are  the  invention  of  Alvan  G.  Clark,  the  celebrated  manufac- 
turer of  telescopes,  and  are  of  a  construction  dissimilar  from  anything  hereto- 
fore followed,  and  are  as  striking  in  their  results  as  Mr.  Clark's  success  in  the 
telescope  objectives  has  been.     They  may  be  used: 

In  all  work  to  which  the  Rapid  Rectilinear  type  may  be  adapted,  when 
they  give  an  angle  of  about  55  degrees  with  stop  f  8,  on  size  of  plate  as  listed. 

As  wide  angle  objectives,  giving  an  aperture  of  about  90  degrees  with  stop 
f  45,  on  larger  sizes  of  plates  up  to  the  stated  limit  of  image  circle.  They  are 
quite  free  from  marginal  distortion  and  magnified  perspective,  so  common  to 
lenses  of  this  class. 

The  lenses  are  uncemented,  each  lens  of  the  combination  being  mounted 
for  itself,  and  are  therefore  free  from  danger  of  gradual  decrease  in  speed,  so 
common  in  many  lenses  owing  to  the  chemical  change  in  the  cement.  The 
crown  glass  is  on  the  outside,  and  therefore  less  liable  to  become  scratched. 

They  possess  less  astigmatism  than  any  known  lenses  of  the  symmetrical 
type.    The  back  combination  may  be  used  on  larger  plates  at  one-half  the  speed. 

These  lenses  are  fully  covered  by  patent. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 

They  are  Supplied  only  with  our  Improved  Iris  Diaphragm. 

Waterhouse  stops  in  place  of  Iris  at  the  same  prices. 


No. 

Size  of  Plate 
working  with 
Stop  F.  8. 

Diameter  of 
Image 
Circle. 

Diameter  of 
Lenses. 

Back  Focus. 

Equivalent 
Focus. 

Brass      j  Aluminum 

Mounting. 
Price.  Price. 

Telegraphic 
Code. 

4i 

8i  in. 

f  in. 

4f  in. 

5i  in. 
6i  " 

$  20.00 

$  23.00 

Abel. 

5 

4x5 

13  " 

i  " 

5f  " 

24.00 

27.00 

Abner. 

8 

5x8 

16  " 

H  " 

7£  " 

8i  " 

30.00 

34.00 

Achan. 

8i 

6£x  8£ 

21*  " 

H  " 

iH  " 

38.00 

42.00 

Adam. 

10 

8  xlO 

24f  " 

if  « 

i2Ty< 

m " 

50.00 

54.00 

Agate. 

12 

10  xl2 

33  " 

n  - 

15  " 

16  " 

64.00 

70.00 

Alema. 

15 

12  xl5 

38  " 

2%  " 

18  " 

19i  " 

82.00 

89.00 

Amasa. 

18 

1(5  x  18 

47  " 

3  " 

22  " 

23xy< 

105.00 

113.00 

Arab. 

22 

20  x22 

64  " 

H  " 

28  " 

30  " 

145.00 

155.00 

Arbah. 

Telegraphic  code  refers  to  lenses  in  brass  mounting ;  if  desired  in  aluminum  it  should  be  so  stated. 


I  2 


BAUSCH  &  LOME  OPTICAL  COMPANY, 


UNIVERSAL  WIDE  ANGLE  LENSES 

F.  16. 


Cut  full  size  No.  8j-. 


In  these  lenses  we  have  sought  to  combine  high  efficiency  with  moderate 
prices  and  the  results  show  that  this  has  been  accomplished  to  an  unusual  degree. 

The  angular  aperture  is  about  100°.  With  these  wide  angles  they  have 
rare  covering  capacity  and  equality  of  illumination.  Further  than  this  the 
largest  stop  gives  a  speed  which  will  allow  of  their  use  in  flash  light  exposures 
and  instantaneous  in  out-door  work  under  favorable  conditions  of  light. 

We  quote  their  capacity  in  a  different  manner  than  is  usually  the  case. 
While  the  angular  aperture  of  the  lenses  is  about  100°,  we  quote  them  working 
with  largest  stop,  and  in  another  column  with  small  stops,  in  each  case  giving 
the  angular  aperture  which  the  lenses  have  on  specified  plates. 

If  a  careful  comparison  is  made  with  other  lists  it  will  be  found  that  they 
are  misleading  in  so  far,  that  while  the  angular  aperture  of  lenses  is  given, 
they  fail,  and  in  some  cases  very  considerably,  from  giving  these  angles  on  the 
plates  for  which  they  are  quoted. 

Sizes  up  to  and  including  8  x  10  are  fitted  with  revolving  diaphragm,  larger 
sizes  with  our  improved  Iris  diaphragm. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 


No. 

Size  of  Plate 
covered 
with  Stop  f.  16. 
Angle  8o°. 

Size  of  Plate 
covered 
with  Stop /.  64. 
Angle  950. 

Diameter 
of 
Image. 
Circle. 

Diameter 
of 
Lenses. 

Back 
Focus. 

Equivalent 
Focus. 

Price. 

Telegraphic 
Code. 

5 

4x5 

5x8 

8f  in. 

£■  in. 

3i  in. 

3*  in. 

$16.00 

Wade. 

8 

5x8 

6£x  8£ 

13  " 

*  " 

U  " 

5*'  «• 

20.00 

Wait. 

8* 

6ix  8£ 

8  xlO 

15  " 

i  " 

<hV  " 

6*  i( 

24.00 

Walk. 

10 

8  xlO 

11  xl4 

18  " 

H  " 

7i  " 

8  " 

28.00 

Walrus. 

14 

11   xl4  ' 

14  xl7 

25£  " 

H  " 

9|  " 

104  " 

36.00 

Water. 

17 

14  xl7 

20  x22 

32  " 

2  " 

13i  " 

14  « 

48.00 

Weaver. 

22 

18  x22 

22  x27 

37  " 

2±  " 

16  " 

17  " 

60.00 

Wale. 

30 

25  x30 

30  x38 

49  " 

2i  " 

20f  " 

22  M 

90.00 

Whistle. 

ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


13 


VELOX  RECTILINEAR  LENSES. 

These  lenses  are  of  the  symmetrical  rectilinear  type.  They  are  carefully  made  and  while  they 
will  not  give  such  results  as  our  Rapid  Universal,  in  definition  or  covering  capacity,  they  are  superior 
to  any  of  the  cheaper  grade  of  lenses  now  on  the  market.  They  are  suitable  for  portraiture,  archi- 
tectural and  all  kinds  of  outdoor  work,  with  a  speed  equal  to  all  shutter  work.  The  back  combina- 
tion may  be  used  separately. 

The  mountings  are  of  the  "black  band"  type,  neatly  finished  and  lacquered,  and  provided  with 
morocco  cap,  and  a  set  of  diaphragms  in  morocco  case. 

Our  Improved  Iris  Diaphragm  may  be  attached  in  place  of  the  Waterhouse  stops  at  a  slight 
advance. 


No. 

Size  of  Plate. 

Diameter  of 
Lenses. 

Back  Fo^us. 

Price. 

Price  with  Iris 
Diaphragms. 

Telegraphic 
Code. 

1 

4x5 

1  in. 

5f  in. 

$10.00 

$13.00 

Veda. 

2 

5x8 

If  " 

8 

15.00 

18.50 

Veer. 

3 

6*  x  Si 

If  '* 

10*  " 

20.00 

23.50 

Veil. 

4 

8  xlO 

2 

13 

25.00 

29.00 

Vendee. 

5 

10  xl2 

2f  " 

15i  " 

35.00 

39.00 

Veneer. 

6 

12  xl5 

H  " 

18 

50.00 

55.00 

Veney. 

7 

16  x20 

8i  " 

22£  " 

70.00 

75.00 

Venge. 

8 

18  x22 

3f  " 

28 

90.00 

96.00 

Venit. 

VELOX  WIDE  ANGLE  LENSES. 

These  lenses  have  an  angular  aperture  of  about  8o°  on  the  plate  for  which  they  are  listed,  but 
have  an  angle  of  about  900  on  the  next  larger  size  plate  ;  the  largest  stop  is  f  16.  They  give  good 
results  when  used  with  suitable  stops  on  interior  and  architectural  work  and  can  be  commended  for 
a  cheap  lens. 


No. 

Size  of  Plate. 

Back  Focus. 

Equivalent  Focus. 

Price. 

Telegraphic 
Code. 

1 

4x5 

3i  in. 

3£  in. 

$10.00 

Vermil. 

2 

5x8 

41  " 

5i  " 

15.00 

Verst. 

3 

6£x  8£ 

6TV  " 

6|  " 

18.00 

Vetch. 

4 

8  xlO 

7*  " 

8  " 

22.00 

Vild. 

5 

11  xl4 

H  " 

10*  " 

28.00 

Villi. 

6 

14  x  17 

13*  " 

14  " 

35.00 

Vacar. 

7 

16  x20 

16 

17  " 

45.00 

Vade. 

8 

20  x24 

20|  " 

22  " 

60.00 

Vague. 

Sizes  up  to  and  including  8  x  10  are  fitted  with  revolving  diaphragm,  larger  sizes  with  our 
improved  Iris  diaphragm. 


SINGLE  ACHROMATIC  LENSES. 

These  lenses  are  carefully  made  up  of  a  positive  crown  and  negative  flint  glass  lens.  They  give 
the  best  possible  spherical  correction  of  this  construction  and  make  the  photographic  image  coinci- 
dent with  the  ground  glass. 

They  are  also  supplied  in  neat  brass  mountings,  nicely  finished  and  lacquered,  which  are 
provided  with  revolving  diaphragms  and  morocco  cap. 


No. 

Size  of  Plate. 

Diameter  of 
Lens. 

Focus. 

Price 
Unmounted. 

Telegraphic 
Code. 

Price 
Mounted. 

Telegraphic 
Code. 

1 

2 
3 
4 
5 

3^x4i 

4  x5 

5  x8 
6£x  8£ 
8  x  10 

it  m. 
li  " 
H  '* 

n  " 

5i  in. 
6i  " 
9  " 
11  " 
13  " 

$1.20 
1.50 
2.00 
2.50 
2.50 

Singe. 

Sinker. 

Sinter. 

Sineus. 

Sinure. 

$2.75 
3.00 
4.50 
6.00 
7.00 

Simia. 

Simil. 

Simoon. 

Simper. 

Simu. 

14 


BAUSCH  &  LOME  OPTICAL  COMPANY, 


TELE-PHOTO  LENSES. 


Cut  full  size  4x5. 


The  purpose  of  Tele-Photo  lenses  is  to  give  enlarged  images  of  distant  objects. 
Their  advantages  are  that  they  give  detail  in  the  picture  not  discernible  to  the 
naked  eye  and  with  a  camera  extension  which  is  very  considerably  less  than 
would  be  required  by  a  single  lens  of  the  same  power. 

While  the  use  to  which  these  lenses  may  be  applied  is  limited,  we  have  sought 
to  give  them  not  only  the  best  possible  optical  result,  but  make  them  easily  appli- 
cable to  lenses  already  in  use  with  the  performance  of  which  the  owners  are  well 
acquainted  and  further  enhance  their  value  by  their  easy  variability  in  power. 
Their  advantage  over  fixed  Tele-Photo  or  long  focus  lenses  are  thus  manifest. 

The  Tele-Photo  attachment  consists  of  two  sliding  tubes  variable  in  length  by 
a  spiral  rack  and  pinion.  The  posterior  end  is  supplied  with  a  flange  which  is 
fixed  to  the  front  board.  At  this  end  is  also  fixed  the  Tele-Photo  lens.  The 
adjustable  tube  is  supplied  at  its  front  end  with  an  adapter,  made  to  suit  any 
regular  photographic  lens  which  it  is  desired  to  use  for  this  purpose.  The  adjust- 
able tube  is  nickel-plated  and  has  a  scale  engraved  upon  it  indicating  the  amount 
of  magnification.    An  increase  in  power  of  eight  times  may  thus  be  obtained. 

The  photo  lenses  to  be  used  in  connection  with  them  should  be  of  the  highest 
quality  as  otherwise  the  result  will  be  a  lack  in  definition  owing  to  the  amplification. 

The  scales  are  designed  for  the  prevailing  foci,  but  may  be  accurately  measured 
for  each  lens  at  an  extra  cost  of  75  cents. 

Price  includes  adapter  for  photographic  lens. 


DISTANCE  FROM  THE  FRONT  BOARD  TO  THE  GROUND  GLASS. 


Size. 

Equivalent 
Focus. 

Power. 

Brass     |  Aluminum 

Mounting. 
Price.  Price. 

3 

4 

5 

6 

7 

8 

4  x5 

5  x8 

8  x  10 

6*  in. 

8f  " 

Hi  " 
13*  " 

6f  in. 

8i  " 
10i  " 
13*  " 

9f  in. 
13  " 
16*  " 
20i  " 

121  in- 

17£  " 
22*, 
27i  " 

16*,  in. 
22  " 
28*  " 

m  " 

19f  in. 
26i  " 
34|  " 
4H  " 

22f  in. 
31  " 
40*  " 

m " 

$16.00 
18.00 
20.00 
24.00 

$20.00 
22  00 
25.00 
30.00 

CIRCLE  OF  LIGHT. 

Telegraphic  Code. 

4x5 
5  x8 
6|  x  8i 
8  x  10 

5i  in. 
6*  " 
8  " 
1    9  " 

7*  in. 

9f  ■' 
11  " 
12f  " 

9£  in. 
12£  " 
14*  " 
16*  " 

12  in. 

16i  " 
18  " 
20f  " 

15  in. 

19f  " 
22  " 
26  " 

17£  in. 

22i  " 
26  " 
30  " 

Tab. 
Tabby. 
Tabid. 
Table. 

Telegraphic  code  refers  to  lenses  in  brass  mounting;  if  desired  in  aluminum  it  should  be  so  stated. 


ROCHESTER,   N.  Y.,   AND  NEW  YORK  CITY. 


15 


Zeiss-Anastigmat  Lenses, 


Since  our  first  introduction  of  these  lenses  in  this  country  the  advantages  of 
their  construction  have  been  so  well  appreciated  that  they  have  become  very  pop- 
ular, and  are  now  accorded  the  highest  rank  in  the  list  of  various  photographic 
lenses.  Time  and  experience  have  shown  the  desirability  of  still  further  increas- 
ing the  number  of  varieties,  so  as  to  fill  every  possible  demand,  and  have  enabled 
the  inventors  to  make  computations  for  still 

Greater  Covering  Capacity  and  a  Higher 
Degree  of  Anastigmatism. 

In  connection  with  these  improvements  it  has  also  been  deemed  advisable  to 
make  a 

Material  Reduction  in  Prices 

in  order  to  still  more  increase  their  popularity. 

While  the  Photographic  literature  is  replete  with  the  'advantages  of  these 
lenses,  it  is  but  proper  that  we  enumerate  them  in  this  connection. 

Freedom  from  Astigmatism. 

Extreme  Wide  Angle  Lenses  free  from  Distortion. 

Exact  Coincidence  of  Visual  and  Photographic  Image 
and  Equal  Magnitude  of  Both. 

Unequalled  Covering  Capacity.   Absolute  Uniformity 

of  Illumination. 

Unusual  Depth  to  the  Proportion  of  Aperture. 
No  Variation  of  Focus  with  Variation  in  Diaphragm. 
No  Flare  Spot  or  Ghost. 


1 6 


BAUSCH  &  LOMB  OPTICAL  COMPANY, 


Being  sole  manufacturer s  under  the  Ai?ierican  Patents,  we  are  supplied  with 
all  computations,  material  and  information  by  the  inventors,  and  with  our  experi- 
ence and  facilities  are  therefore  fully  competent  to  make  them  of  equal  perfection. 
We  lay  special  stress  upon  this  point,  as  the  impression  may  prevail  in  some  minds 
that  the  firm  of  Carl  Zeiss  may  have  one  or  another  slight  advantage,  which,  how- 
ever, is  not  in  the  least  degree  the  case.  In  fact  we  may  say  that  the  contrary  is 
the  case,  in  as  much  as  having  been  made  sole  licensees  for  this  country,  it  was 
for  the  express  purpose  of  meeting  all  orders  promptly  under  an  absolute  guar- 
antee of  the  highest  quality  and  assuming  all  risks  during  transportation. 

As  with  all  articles  of  acknowledged  superiority,  unscrupulous  parties  have 
endeavored  to  mislead  the  public  by  the  adoption  of  the  name  "  Anastigmat,"  or 
claiming  that  their  lenses  possessed  the  same  advantages,  we  cannot  guard  the 
public  too  strongly  to 

BEWARE  OF  IMITATIONS. 

All  of  our  lenses  are  plainly  marked  Zeiss-Anastigmat,  Bausch  &  Lomb 

Opt.  Co.,  Date  of  Patent,  Series  to  which  they  belong,  and  size  of  plate. 

The  sizes  of  plates  given  in  the  lists  represent  the  covering  powers  corres- 
ponding to  the  stop  indicated  at  the  head  of  the  column  of  plate-sizes.  In 
supplying  these  figures  it  is  implied  that,  as  is  required  for  usual  work  (landscape 
and  instantaneous  photography),  the  focusing  produces  perfect  sharpness  up  to 
the  ??iargin  and  that  the  illumination  is  uniform  from  the  center  to  the  margin. 

Where  these  restrictions  do  not  exist,  plates  of  considerably  larger  sizes 
may  be  used. 

The  diameters  of  the  image  circles  contained  in  the  third  column  imply 
focusing  of  distant  objects;  these  diameters  represent  the  guaranteed  minimum 
in  each  case  and  are  obtainable  with  sufficient  sharpness  with  the  smallest  stops. 
The  actual  image  circle  obtained  with  a  small  stop  on  closer  objects  is  in  nearly 
all  cases  even  larger. 

The  greatest  possible  care  is  taken  in  construction  and  no  lens  is  sent  out 
until  it  has  been  rigidly  tested  and  found  to  come  up  to  its  standard  efficiency. 


ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


I? 


ZEISS-ANASTIGM  AT,  1  :  4.5 

Series  |. 


(Cut  £  size  No.  L) 


RAPID  LENSES  FOR  PORTRAIT  AND  GROUP  PHOTOGRAPHY 

IN  THE  STUDIO. 

Lenses  of  this  series  are  intended  for  portraits  and  in  this  direction  give 
exceedingly  fine  results.  They  are  quick  working  and  give  an  exact  reproduction 
of  the  subject,  being  wide-angle  they  are  especially  suited  to  figures  and  groups. 
On  account  of  the  extreme  difficulty  of  producing  glass  of  suitable  size,  this  series 
is  limited  to  one-half  size  plate. 

These  lenses  may  also  be  used  for  all  other  purposes  such  as  copying,  out  door 
and  architectural  work,  and  on  interiors  when  not  more  than  an  angle  of  750  is 
required. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 

They  are  Supplied  with  our  Improved  Iris  Diaphragm. 

Waterhouse  stops  in  place  of  Iris  at  same  price. 


No. 


Size  of  Plate 
covered  with 
top/.  6.3. 

Diagonal  of  Larg- 
est Plate  covered 
with  Sm.  Stop  70°. 

Free  Diameter 
of 

Largest  Lens. 

Equivalent 
Focus. 

Brass     |  Aluminum 

Mounting. 
Price.  Price. 

2fx  3iin. 
3ix  4i  " 
4x5" 
4±  x  6i  44 
5x7" 
5x8" 
6|x  8J  " 
8  x  10  ' 

8i  " 

10  A  " 

12*  " 
14A  " 
16&  " 
19  i  "* 
22p6  " 

1  i  in. 

1A  " 
If  " 

2  f* 
2f  " 

di  - 
m - 

5  I  in. 

°T6 

7*  " 

10  i  " 

1113  •< 

11  1  6 

16  f  " 

$  47.00 
60.00 
73.00 
101.00 
140.00 
179.00 
224.00 
279.00 

$  51.00  , 
61.00 
78.00 
106.00 
146.00 
185.00 
232.00 
288.00 

Telegraphic 
Code. 


Zone. 

Zinck. 

Zett. 

Zemo 

Zahn. 

Zimmer. 

Zuhn. 

Zodel. 


Telegraphic  code  refers  to  lenses  in  brass  mounting  ;  if  desired  in  aluminum,  it  should  be  so  stated. 
For  pairing  two  lenses  for  stereoscopic  work,  extra,  .$3.00. 


l8  BAUSCH  &  LOME  OPTICAL  COMPANY, 


ZEISS- ANASTIGM AT,  1  :  6.3. 

Series  ||. 


(Cut  full  size  No.  2.) 


EXTREMELY  RAPID  INSTANTANEOUS  LENS,  ALSO  FOR  POR- 
TRAITS, GROUPS  AND  COPYING. 

This  Series  is  remarkable  for  its  perfect  anastigmatic  flatness  of  field  in 
conjunction  with  its  great  relative  rapidity.  On  portraits  and  groups  the  larger 
sizes  give  unusually  fine  results,  combining  speed  with  delicate  definition  and 
depth. 

For  outdoor  work  they  may  be  used  to  the  limit  of  angle  85°  without 
sacrifice  of  flatness,  and  the  smaller  numbers  are  particularly  suitable  for  uni- 
versal purposes  of  the  amateur  and  professional,  giving  a  speed  equal  to  all 
demands,  with  unusual  depth. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 


They  are  Supplied  with  our  Improved  Iris  Diaphragm. 

Waterhouse  stops  in  place  of  Iris  at  s-.me  price. 


No. 

Size  of  Plate 
covered  with 

Diagonal  of  Larg- 
est Plate  covered 

Free  Diameter 
of 

Equivalent 
Focus. 

Brass      |  Aluminum 
Mounting. 

Telegraphic 
Code. 

Stop  y.  9. 

with  Sm.  Stop  8o°. 

Largest  Lens. 

Price. 

Price. 

1 

2f  x   3i  in. 

5  |  in. 

i  in. 

3  f  in. 

!  %  28.00 

$  81.00 

Z  after. 

2 

3±  x  4±  " 

1  " 

4i  " 

31.00 

34.00 

Zany. 

3 

4x5" 

9  i  " 

1 

5|  " 

38.00 

41.00 

Zealous. 

4 

4ix  6£  " 

111  " 

6H  " 

47.00 

51.00 

Zedoary. 

5 

5x7" 

13*  " 

Si  " 

60.00 

64.00 

Zephyr. 

6 

5x8" 

16  £  " 

If  M 

m  " 

73.00 

78.00 

Zigzag. 

7 

6£  x  8£  " 

191t  » 

2 

nit  - 

101.00 

106.00 

Zinc. 

8 

8  xlO  " 

23H  " 
28TV  " 

2f  " 

140.00 

146.00 

Zincky. 

10  x 12  " 

913  << 
~TtT 

i«H  " 

179.00 

185.00 

Zodiac. 

10 

11   xl4  " 

33H  " 
85$  " 

3i  " 

20TV  " 
23  i  " 

224.00 

232.00 

Zone. 

11 

12  xl5  " 

279.00 

288.00 

Zoology. 

Telegraphic  code  refers  to  lenses  in  brass  mounting  ;  if  desired  in  aluminum,  it  should  be  so  stated 
For  pairing  two  lenses  for  stereoscopic  work,  extra,  $3.00. 


ROCHESTER,  N.  Y.,  AND  NEW   YORK  CITY. 


19 


ZEISS- ANASTIG-MAT,  1:8. 

Series  ||a. 


(Cut  full  size  No.  2.) 


FOR  PORTRAITS,  GROUPS,  INSTANTANEOUS  OUTDOOR  WORK 

AND  COPYING. 

The  lenses  of  this  new  Series  are  composed  of  five  lenses  and  have  an  angle 
of  8o°  and  being  of  relatively  slower  speed  it  has  been  possible  to  compute  them 
for  an  absolutely  flat  image,  free  from  all  astigmatism  and  extremely  sharp  definition. 
While  the  lenses  of  Ilia  Series  have  up  to  the  present  been  considered  the  most 
desirable  outdoor  lenses,  the  lenses  of  this  Series  will  undoubtedly  in  most  cases 
be  preferred,  since  they  retain  all  the  desirable  qualities,  except  a  slightly  reduced 
angle  with  greater  speed.  In  fact,  the  speed  will  be  found  ample  for  all  ordinary 
instantaneous  exposures,  giving  an  unusual  evenness  of  illumination,  flatness  and 
depth.    In  the  studio  they  are  well  adapted  for  large  heads,  figures  and  groups. 

These  lenses  are  also  particularly  adapted  to  copying  and  half-tone  work,  giving 
minutest  detail  with  extreme  flatness  to  the  edges. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 


They  are  Supplied  with  our  Improved  Iris  Diaphragm. 

Waterhouse  stops  in  place  of  Iris  at  the  same  prices. 


No. 

Size  of  Plate 
covered  with 
Stop  f.  12.5. 

Diagonal  of 
Largest  Plate 
Covered  with 
Small  Stop  720. 

Free  Diameter 
of 

Largest  Lens. 

Equivalent 
Focus. 

Brass     |  Aluminum 

Mounting. 
Price.  Price. 

Telegraphic 
Code. 

1 
2 
3 
4 
5 
6 
7 
8 

4  x  5  in. 
4±x  6i" 
5x8" 
6£x  8£  " 
8  xlO  " 

10  xl2  " 

11  xl4  " 
14  xl7  " 

6f  in. 

8i  " 
10i  " 
12f  " 
14f  " 
17f  " 
21i  " 
26i 

1  in. 
t  " 

1  " 

1*  " 
ItV  " 
If  " 

2  " 

m  " 

4f  in. 

5f  " 
6£  " 
8  " 
9f  " 
Hf  M 
13f  " 
17  " 

'$  28.00 
31.00 
41.00 
51.00 
60.00 
80.00 
117.00 
150.00 

$  31.00 
34.00 
44.00 
54.00 
63.00 
85.00 
122.00 
156.00 

Zaba. 

Zaccho. 

Zapha. 

Zamia. 

Zapote.  . 

Zarmich. 

Zax. 

Zayah. 

Telegraphic  code  refers  to  lenses  in  brass  mounting  ;  if  desired  in  aluminum  it  should  be  so  stated. 
For  pairing  two  lenses  for  stereoscopic  work,  extra,  $3.00 


20 


BAUSCH  &   LOMB   OPTICAL  COMPANY, 


ZEISS-ANASTIGMAT,  1:7.2 


Series  ill 


(Cut  full  size  No.  2.) 

INSTANTANEOUS  LENS  FOR  STUDIO  WORK  ON  GROUPS, 
LARGE  HEADS,  OUTDOOR  WORK  OF  ALL  KINDS 
AND  COPYING. 

The  lenses  of  this  Series  are  double  unsymmetrical  combinations,  consisting 
of  a  front  combination  of  two  lenses,  and  a  back  system  of  three  lenses.  They 
are  placed  close  together  although  the  space  between  them  is,  in  all  except  No.  i, 
sufficient  to  admit  of  the  introduction  of  our  Diaphragm  Shutter. 

The  lenses  of  this  Series  have  an  angular  aperture  from  85 °  to  900,  and  can 
therefore  be  used  as  wide  angle  lenses  if  desired.  The  relative  diameter  of  lenses 
is  about  1  to  6.  The  largest  stop,  however,  is  f  7.2.  As  indicated  above,  they  are 
intended  for  use  in  all  kinds  of  photographic  work  except  in  poorly  lighted  studios. 
They  have  a  greater  speed  than  almost  all  rapid  lenses  now  in  the  market,  and 
for  copying  particularly,  have  no  equal  for  the  same  aperture. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 

They  are  Supplied  with  our  Improved  Iris  Diaphragm. 

Waterhouse  stops  in  place  of  Iris  at  same  price. 


No. 


Size  of  Plate 
covered  with 
Stop/".  12.5. 


3£x 

4  x 
4£x 

5  x 
5  x 
6£x 
8  x 

10  x 
12  x 


41  in. 
5  " 
6*" 

7  " 

8  " 
8£" 

10  " 
12  " 
15  " 


Diagonal  of 
Largest  Plate 
Covered  with 
Small  Stop  8o°. 


«T<f 

n 
1?1 

20  % 
29  i 


in. 


Free  Diameter 
of 

Largest  Lens. 


4 

l 

U 

u 

2 


Equivalent 
Focus. 


°T6 
4f 


17  f 
23TV 


Brass  Aluminum 

Mounting. 
Price.  Price. 


$  23.00 
26.00 
30.00 
39.00 
49.00 
59.00 
78.00 
124.00 
176.00 


$  26.00 
30.00 
33.00 
43.00 
52.00 
64.00 
83.00 
130.00 
184.00 


Telegraphic 
Code. 


Zumic. 

Zurbite. 

Zoonic. 

Zoolite. 

Zomar. 

Zode. 

Zizel. 

Zorcon. 

Zincode. 


Telegraphic  code  refers  to  lenses  in  brass  mounting;  if  desired  in  aluminum  it  should  be  so  stated. 
For  pairing  two  lenses  for  stereoscopic  work,  extra,  $3.00. 


ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


2  I 


ZEISS- ANASTIGM  AT,  1:9. 

Series  Ilia.. 


(Cut  full  size  No.  2.) 


INSTANTANEOUS  OUTDOOR  LENS,  ALSO  GROUPS  AND  LARGE 

PORTRAITS. 

The  lenses  of  this  series  are  composed  of  five  lenses  and  have  an  angle  of 
90°.  They  have  perfect  anastigmatic  flatness,  without  distortion,  even  when 
used  to  the  full  limit  of  their  angle.  They  have  sharp  definition,  even  illumi- 
nation and  unusual  depth,  which  adapts  them  to  all  outdoor  work  and  particu- 
larly to  hand  camera  work.  In  this  direction  they  surpass  any  known  lens, 
their  speed  being  ample  for  all  ordinary  instantaneous  work.  Where  very  quick 
exposures  are  desired  the  lenses  of  the  Series  II  or  II  a  should  be  selected. 

While  not  of  sufficient  speed  for  quick  exposures  in  the  studio,  the  larger 
numbers  are  well  adapted  for  larger  heads  and  groups.  They  are  also  well 
adapted  for  copying. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 

They  are  Supplied  with  our  Improved  Iris  Diaphragm. 


Waterhouse  stops  in  place  of  Iris  at  same  price. 


No. 

Size  of  Plate 
covered  with 
Stop  f.  12.5. 

Diagonal  of 
Largest  Plate 
Covered  with 
Small  Stop  qo°. 

Free  Diameter 
of 

Largest  Lens. 

Equivalent 
Focus. 

Brass  Aluminum 

Mounting. 
Price.  Price. 

Telegraphic 
Code. 

0 

2f  x  3±  in. 

ft  in- 

3  in. 

$  20.00 

$   

Zas. 

00 

3ix  4i  " 

i  " 

3f  " 

20.00 

Zif. 

1 

4x5" 

9TV  in. 

4,4  " 

21.00 

Zinn. 

2 

4ix  6£  " 

lHf  " 

f  " 

51  " 

25.00 

Zihn. 

3 

5x7" 

13ft  «.' 

1  n 

6f  " 

30.00 

33.00 

Zeguel. 

4 

5x8" 

1  " 

m  " 

33.00 

36  00 

Zaddow. 

5 

6£x  8£  " 

18  i  " 

U  " 

43.00 

46.00 

Zerial. 

6 

7x9" 

21ft  " 

17  << 

10f  " 

52.00 

56.00 

Zerious. 

7 

8  xlO  " 

25  " 

12  i  " 

65.00 

70.00 

Zerf. 

8 

10  x  12  " 

32  " 

2  " 

16  " 

98.00 

103.00 

Zerge. 

9 

11  xl4  " 

39  f  " 

2ft  " 

2U  " 

191  " 

130.00 

137.00 

Zet. 

10 

12  xl5  " 

47  i  " 

23  f  " 

163.00 

169.00 

Zeton. 

11 

14  xl7  " 

54  f  " 

27 T\  " 

211.00 

219.00 

Zetto. 

12 

16  x20  " 

64ft  " 

32i  " 

260.00 

268.00 

Zeven. 

Telegraphic  code  refers  to  lenses  in  brass  mounting ;  if  desired  in  aluminum  it  should  be  so  stated. 
For  pairing  two  lenses  for  stereoscopic  work,  extra,  $3.00. 


22 


BAUSCH  &  LOMB  OPTICAL  COMPANY, 


ZEISS-ANASTIGMAT,  1:12.5. 

Series  IV. 


* 


Cut  full  size  No.  5. 

AN  INSTANTANEOUS  WIDE  ANGLE  LENS  FOR  LANDSCAPES, 
INTERIORS,  ARCHITECTURE  AND  COPYING. 

The  lenses  of  this  Series  form  two  unsymmetrical  systems,  both  of  which  are 
composed  of  two  cemented  lenses,  placed  close  together,  although  the  numbers 
above  No.  5  will  admit  of  the  adaptation  of  Diaphragm  Shutter. 

The  field  of  the  smaller  lenses  including  No.  6  measures  an  angle  of  ioo°, 
while  in  the  larger  ones  it  is  about  850.  The  smaller  numbers  including  No.  6 
admit  of  a  pencil  of  relative  aperture  1:10  and  the  larger  ones  1:12.  The 
larger  stop  has  an  aperture  of/.  12.5. 

This  Series  is  therefore  wide  angle  and  as  such  may  be  used  for  all  out-door 
work  with  full  aperture,  which  has  unusual  value  in  a  large  variety  of  work.  It 
is  of  course  understood  that  they  may  be  used  on  smaller  plates  with  correspond- 
ingly reduced  angle. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 

The  mountings  of  the  smaller  numbers,  including  No.  5,  are  provided  with 
revolving  diaphragms  only,  and  the  larger  ones  are 

Supplied  with  our  Improved  Iris  Diaphragm. 


No. 

Size  of  Plate 
covered  with 
Stop  f.  18. 

Diagonal  of 
Largest  Plate 
Covered  with 
Small  Stop  96°. 

Free  Diameter 
of 

Largest  Lens. 

Equivalent 
Focus. 

Brass  Aluminum 

Mounting. 
Price.  Price. 

Telegraphic 
Code. 

1 
2 
3 
4 
5 
6 

The  follow 
7 

8 
9 

10 

S\  x   4i  in. 
4x5" 
4±x  6*  " 
5x8" 
8  xlO  " 
10  xl2  " 

ng  sizes  for  copy 

12  xl5  " 
16  x20  " 
20  x  24  " 
24  x  30  " 

5±  in. 

10  f  " 
131  " 
17T\  " 
22||  " 

ng  with  Stop  f.  1 

27ft  " 

43fV  " 
64T3e  " 
86  i  " 

i  in. 

1  " 
I  " 
*  " 

13  << 

56at85Q.  ForL 

2  " 
015  << 

8f  " 

2T\  in. 
Si  " 

All  •< 

6TV  " 
7H  " 
10  i  u 

andscape  Work  h 

15T\  " 
2SH  " 
35U  " 
48  f  " 

$  17.00 
17.00 
20.00 
23.00 
30.00 
44.00 

irger  pjates 

67.00 
117.00 

263.00 
588.00 

$  

33.00 
47.00 

nay  be  use 

70.00 
122.00 
270.00 
596.00 

Zibet. 

Zeud. 

Zoffer. 

Zein. 

Zircon. 

Zoril. 

I. 

Zennir. 
Zofil. 
Zodic. 
Zunn. 

Telegraphic  code  refers  to  lenses  in  brass  mounting ;  if  desired  in  aluminum  it  should  be  so  stated. 
For  pairing  two  lenses  for  stereoscopic  work,  extra,  $3.00. 


ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


23 


ZEISS-ANASTIG-MAT,  1 :  18 

Series  V. 


Cut  full  size  No.  6. 


WIDE  ANGLE  LENS,  PAR  EXCELLENCE,  FOR  INTERIORS, 
ARCHITECTURE,  COPYING  AND  LANDSCAPES. 

The  lenses  of  this  Series  are  similar  in  construction  to  those  of  Series  IV,  the  numbers  above 
No.  5  admit  of  the  fitting  of  the  Diaphragm  Shutter.  £j 

The  field  of  the  smaller  numbers,  including  No.  7,  measures  108°,  while  that  of  the  larger  ones 
is  90°  and  above. 

In  the  smaller  sizes,  including  No.  7,  the  ratio  of  aperture  to  focus  is  about  1 : 13  and  the 
larger  ones  1 : 17.     The  largest  stop  has  an  aperture  of  f.  18. 

The  smaller  numbers  of  this  Series  are  wide-angle  lenses  proper,  and  are,  in  spite  of  their  very 
wide  angle,  sufficiently  rapid  to  be  available  for  instantaneous  work  with  sunlight  illumination. 
•Considering  the  unequalled  extent  of  angle  this  capacity  is  unapproached  by  any  known  lens. 
They  are  therefore  useful  for  many  purposes.  The  entire  field  is  orthoscopic,  notwithstanding 
the  dissymmetrical  construction  of  the  lens. 

The  larger  lenses,  of  18&  focus  and  upwards,  are  in  particular  intended  for  reproductions  of 
-charts;  they  yield  a  perfectly  fiat  and  anastigmatic  image,  subtending  an  angle  of  60°,  and  are  per- 
fectly free  from  distortion.    Even  with  stop  1 : 18  the  picture  exhibits  the  sharpness  of  an  engraving. 

Our  new  test  chart  (copyrighted)  accompanies  each  lens. 

The  mountings  are  similar  in  construction  to  those  of  Series  IV,  and  have  the  same  general 
appearance.  All  the  smaller  sizes,  including  No.  6,  have  revolving  diaphragm  only,  and  the 
larger  sizes  are  supplied  with  our  Improved  Iris  Diaphragm. 


No. 

Size  of  Plate 
covered  with 
Stop  f.  36. 

Diag.ofLarg.Pl. 
Cov.  with  Sm. 
Stop  io4°-no°. 

Free  Diameter 
of 

Largest  Lens. 

Equivalent 
Focus. 

Brass.     |  Aluminum. 

Mounting. 
Price.  Price. 

Telegraphic 
Code. 

1 

4£x  6£in. 

f 

3f  in. 

!  $  21.00 

$   

Zambo. 

2 

5x7 

11 

21.00 

Zanite. 

3 

6£x  8* 

\ 

26.00 

Zeal. 

4 

8  xlO 

15| 

9 

33.00 

Zebra. 

5 

10  xl2 

21i 
26f 

H 

41.00 

44.00 

Zebu. 

6 

11  xl4 

if 

51.00 

54.00 

Zealot. 

7 

12  xl5 

311 

60.00 

64.00 

Zenith. 

For  reproduction  of  charts  and  all  kinds  of  copying  on  large  plates  when  used  at  an  angle  of  85' 


9 

10 
11 
12 


x  15 
x  18 
x  25 
x  34 
x44 


33 


94£ 
118* 


1 

If 
8* 
3 


m 

24i 
37A 

65f 


80.00 
117.00 
231.00 
393.00 
653.00 


83.00 
120.00 
237.00 
401.00 
662.00 


Zulo. 
Zero. 
Zest. 
Zythum. 
Zimome. 


Telegraphic  code  refers  to  lenses  in  brass  mounting ;  if  desired  in  aluminum,  it  should  be  so  stated 
For  pairing  two  lenses  for  stereoscopic  work,  extra,  $3.00. 


^4 


BAUSCH  &  LOME  OPTICAL  COMPANY, 


DIAPHRAGM  SHUTTER. 


Cut  full  size  4x5. 


No  shutter  has  ever  been  introduced,  the  advantages  of  which  have  been  so" 
quickly  appreciated  and  which  from  its  first  appearance  has  been  conceded  to 
excel  all  others.    It  has  stood  the  test  of  years  and  is  without  a  rival. 

It  requires  little  argument  to  show  that  the  proper  place  for  opening  and 
closing  a  shutter  is  in  the  optical  axis  of  the  lens,  and  in  both  time  and  instan- 
taneous photography,  it  is  evident  that  this  shutter,  starting  its  opening  with  a 
pin-hole  and  gradually  increasing  to  the  size  of  stop  for  which  it  is  set,  and 
returning  in  the  same  manner,  will  give  the  effect  of  a  small  stop,  i.e.,  more  depthr 
flatness  and  equality  of  illumination.  Comparative  tests  show  that  in  practice 
these  advantages  are  obtained  to  a  marked  degree. 

Furthermore,  the  quality  of  workmanship  in  these  shutters  is  altogether 
superior  to  that  in  other  devices.  This  and  the  construction  enables  us  to  adapt 
lenses  to  them  under  the  exact  original  conditions  and  truly  centered,  a  fact  of 
the  greatest  importance,  as  there  is  not  the  slightest  depreciation  in  any  of  the 
good  qualities  which  a  lens  may  possess. 

This  shutter  meets  every  requirement  of  gallery  and  out-door  work ;  we 
disclaim,  however,  its  suitability  to  so-called  "lightning  work,"  although  surprising 
results,  such  as  trains  running  sixty  miles  an  hour,  and  trotting  horses,  show  its 
capacity  under  suitable  management.  •  For  all  other  work  it  has  no  rival,  either 
in  its  results,  advantages,  conveniences  or  workmanship. 

While  the  shutter  is  easy  and  delicate  in  its  action,  and  from  its  variety  of 
motions  comparatively  complicated,  there  is  no  danger  in  this  fact,  as  the  parts 
exposed  to  wear  are  especially  strong.  There  are  no  weak  points  and  with 
ordinary  care,  there  is  not  the  slightest  deterioration  in  its  operation.  Its 
reputation  is  not  alone  confined  to  this  country,  but  it  is  used  at  every  point  of 
the  globe  where  photography  is  practiced. 


ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


All  the  parts  to  be  operated  are  at  the  front  and  easy  of  access.  The  upper 
lever  sets  the  shutter  without  making  an  exposure ;  the  lower  sets  for  time  or 
instantaneous  exposure.  The  larger  black  disk  sets  the  size  of  opening;  the 
smaller  for  time  of  exposure,  varying  from  3  to  1-100  seconds.  The  shutter  is  very 
compact  and  well  balanced  in  its  operation  so  that  there  is  no  jar,  even  at  its 
quickest  speed,  while  making  an  exposure. 

Its  advantages  over  other  constructions  are :  • 
It  gives  greater  depth,  more  even  illumination,  greater  covering 
capacity. 

It  allows  a  variation  in  speed  from  i-ioo  to  3  seconds. 

It  gives  every  variation  in  size  of  stops  from  pinhole  to  full  opening. 

It  does  not  jar  the  camera. 

Can  be  operated  by  rubber  bulb  or  finger  release. 
Requires  the  setting  of  one  lever  only  for  each  exposure. 
Can  be  easily  applied  to  hand  cameras. 
Makes  no  exposure  when  setting. 

Its  workmanship  is  of  the  highest  grade,  with  lenses  true  and 
optically  centered.   

On  account  of  the  variations  in  size  and  pitch  of  threads  and  varying  condi- 
tions in  the  lenses  of  the  same  make,  we  assume  no  responsibility  in  fitting  unless 
the  complete  lenses  are  sent  us,  whether  of  our  or  other  manufacture. 


When  fitted  to  Rapid 
Universal,  Extra 
Rapid  Universal  or 
Velox  Lenses  with 
regular  barrel  and 
Diaphragm. 


4  x5 

5  x8 

6ix8i 
8x  10 


$14.00 
15.00 

16.00 
17.50 


Alvan  G.  Clark. 


No.  4± 

No.  5  $15.00 
No.  8 


No.  8+ 
No.  10 


17.50 


Zeiss- Anastigmat, 
Series  I. 


No.  1  $15.00 


No.  2 
No.  3 


17.50 


Zeiss-Anastigmat, 
Series  II. 


No.  3  $15.00 
No.  1* 

No.  2*  16.00 
No.  4 


No.  5 
No.  6 


17.50 


Zeiss-Anastigmat, 
Series  \\a 
and  \\\a. 


fj&|  $15.00 


No. 
No. 


4 

0* 


No.  00- 


No.  v 

LNo.  5 
(  No.  6 
\  No.  7 
No.  8 


17.50 


Zeiss-Anastigmat, 
Series  III. 


No.  2  $15.00 
No.  3 


No.  1* 

No.  4  16.00 
No.  5 


No.  6 
No.  7 


17.50 


4  x5 

5  x8 


6ix8£ 


8x  10 


Zeiss-Anastigmat, 
Series  IV. 


fNo. 
I  No. 
)  No. 

No. 
!  No. 
LNo. 

No. 
No. 


16.00 


17.50 


Zeiss-Anastigmat, 
Series  V. 


fNo.  1* 
No.  2* 
No.  3* 
No.  6 
No.  7 
No.  8 
No.  4* 
No.  5* 
No.  9 


16.00 


17.50 


When  fitted  to  lens 
esof  other  manu- 
facture leaving 
barrel  intact. 


$14.50 
15.50 


16.50 


18.00 


Extra  for 
Aluminum. 


$4.00 
4.50 


5.00 


>.50 


Opening  of 
Largest  Stop. 


i  in. 


If  " 


Telegraphic 
Code. 


Dalphon. 
Danites. 


Dara. 


Darius. 


To  graduate  disk  to  correspond  with  stop  accompanying  lens,  extra,  $  .50. 

Finger  release  attachment  to  shutters,  f  to  T8¥  size,  extra,  $1.00.  (f 
way  at  no  additional  charge.) 

Telegraphic  code  refers  to  shutters  in  brass  mounting  ;  if  desired  in  aluminum  it  should  be  so  stated. 

*  Indicates  shutter  being  fitted  to  back  of  lens;  cannot  otherwise  be  adapted  on  account  of  combi- 
nation of  lenses  being  too  close  together. 


SIZE  OF  SHUTTER  OVER  ALL  IN  HEIGHTH  AND  WIDTH. 

Size  of  Opening,  |  1£  If  If 

inches.  2f  x  4  3£  x  4£  3f  x  5i  4i  x  5£ 


26  BAUSCH  &  LOMB  OPTICAL  COMPANY, 

 »  

B.  &  L.  STEREOSCOPIC  SHUTTER. 


Cut  %  actual  size. 


At  this  time  when  stereoscopic  photography  is  becoming  more  popular  and 
where  a  suitable  shutter  for  almost  all  work  in  photography  has  become  a  neces- 
sity, a  good  stereoscopic  shutter  properly  constructed,  offering  advantages  not 
possessed  by  others,  is  important. 

In  designing  this  we  have  as  much  as  possible,  applied  the  desirable  features 
of  our  Diaphragm  Shutter,  which,  with  the  balance  of  the  construction  makes  this 
unquestionably  the  best  shutter  now  before  the  public. 

The  centers  of  opening  are  3^-  inch  apart.  The  action  of  the  leaves  is  abso- 
lutely synchronous,  thus  giving  the  same  amount  of  exposure  through  both  lenses. 
Revolving  diaphragms  are  provided  for  stops.  The  speed  regulator  of  our 
Diaphragm  Shutter  is  applied,  thus  giving  all  variations  in  speed  from  t-J-q  to  3 
seconds.    Release  may  be  made  by  bulb  or  finger. 

We  make  these  shutters  in  two  forms. 

A.  Unless  otherwise  ordered,  this  is  always  sent.  In  this  form  the  openings 
are  made  diamond  shape,  starting  from  a  small  square  opening,  which  is  the  nearest 
approach  to  the  diaphragm  shutter  and  gives  similar  effects. 

B.  The  blades  open  with  a  horizontal  parallel  opening  over  the  entire  diameter, 
having  a  slight  wedge  form  at  full  opening.  This  form  gives  more  exposure  for 
the  same  amount  of  time  and  is  preferable  where  it  is  desired  to  make  very  quick 
exposures. 

In  applying  the  shutter  it  is  screwed  directly  on  the  front  board  of  camera. 
In  attaching  lenses  we  can  assume  no  responsibility  in  accurately  fitting  unless 
lenses  are  in  our  possession. 


Opening. 

Rapid 
Universal. 

A.  G. 
Clark. 

Velox 
Rectilinear. 

Zeiss-Anastigmat. 

Price. 

Series  II. 

Series  \\a. 

Series  III. 

Series  Ilia. 

Brass. 

Alumi- 
num. 

£  in. 

No.  5 

No.  5 

No.  1 

No.  2 

No.  2  &  3 

No.  2  &  3 

No.  2  &  3 

$18.00 

$22.00 

ROCHESTER,  N.  Y.,  AND  NEW  YORK  CITY. 


27 


IRIS  DIAPHRAGM. 


After  a  series  of  experiments  we  have  devised  a  new  construction  which  offers 
manifest  advantages  over  the  forms  hitherto  used.  While  the  desirability  of  iris 
diaphragms  have  been  fully  appreciated  many  have  been  deterred  from  using 
them  or  have  discarded  them  on  account  of  poor  workmanship  and  consequent 
liability  to  get  out  of  order,  lack  of  compactness  in  mounting,  and  then  because 
the  intertwining  leaves  being  made  of  metal  and  chemically  blackened,  have  lost 
their  black  from  friction  and  created  internal  reflections  which  are  fatal  to  good 
results. 

In  those  of  our  construction  the  leaves  are  made  of  hard  rubber,  with  mat 
surfaces  which  will  always  remain  black  and  furthermore  add  no  weight  to  the 
mounting.  When  applied  to  our  lenses,  there  is  no  projecting  ring  except  in  a  few 
of  the  larger  sizes,  but  the  entire  iris  diaphragm  is  contained  within  the  tube. 
Having  constructed  special  machinery,  all  work  is  done  with  the  greatest  accuracy, 
effecting  a  circular  opening  and  a  change  in  size  is  produced  with  the  utmost 
delicacy.  On  some  of  our  lenses  we  have  made  no  advance  in  price  for  replacing 
these  diaphragms  over  the  ordinary  loose  stops,  while,  where  it  has  been  necessary, 
the  extra  charge  is  slight. 

We  will  apply  these  diaphragms  to  other  lenses  than  our  own;  but  on  account 
of  the  differences  in  sizes  of  tubes  it  will  be  necessary  to  make  the  mounting  of 
the  diaphragm  project  beyond  the  diameter  of  adapters  to  which  the  lens  mounts 
will  be  fitted.  The  opening  is  varied  by  a  milled  edge,  whereas  in  the  other  form 
it  is  done  by  a  small  lever  with  pointer. 

Prices  include  Iris  Diaphragm  and  the  necessary  adapters  for  receiving  the 
lens  mounts. 


No. 


Diameter 
of  Opening. 


Price. 


Telegraphic  Code. 


1 

2 
3 
4 
5 
6 
7 
8 
9 


$4.50 
5.00 
6.00 
6.00 
7.00 
7.00 
8.00 
8.00 

10.00 


Ibex. 

Ibid. 

Ibis. 

Ichor. 

Icon. 

Idea. 

Idem. 

Idest. 

Idiom 


28 


BAUSCH  &   LOME   OPTICAL  COMPANY, 


PRISMS. 


These  Prisms  are  intended  to  be  used  in  all  classes  of  photo-mechanical  pro- 
cesses. They  invert  the  image  and  make  stripping  of  the  film  unnecessary.  The 
glass  is  specially  made  for  us,  of  the  highest  possible  excellence,  the  surfaces  are 
as  accurately  ground  and  polished  as  the  surfaces  of  a  first-class  lens,  so  as  to  give 
an  absolutely  true  reflection  of  the  image.  The  hypothenuse  is  carefully  silvered. 
These  prisms  are  in  lacquered  brass  mountings  and  arranged  to  fit  the  hood  of 
lens. 

In  estimating  the  size  of  prism  which  is  required  for  a  particular  lens,  a  size 
should  be  selected  which  is  at  least  equal  to  the  diameter  of  the  hood.  A  size 
which  is  larger  than  this  is  preferable,  but  under  no  condition  should  a  smaller 
one  be  selected,  as  in  the  work  in  which  these  prisms  are  required,  it  is  of  great 
importance  to  utilize  all  the  possible  light  which  the  lens  can  transmit. 


Fitted  to 

Fitted  to 

Fitted  to 

Fitted  to 

Fitted  to 

Fitted  to 

Price  when 

Full 

Rapid  Univ. 

Zeiss-An- 

Zeiss-An- 

Zeiss-An- 

Zeiss- An- 

Zeiss-An- 

Price. 

fitted  to 

Aperture. 

and 
Alvan  G. 

astigmat, 

astigmat. 

astigmat, 

astigmat, 
Series  IV. 

astigmat, 

other 

Series  II.  a. 

Series  III. 

Ser.  Ula. 

Series  V. 

Lenses. 

Clark  Lenses. 

H  in. 

No.  4J 

Nos.  1  &  2 

Nos.  1  &  2 

Nos.  1  &  2 

Nos.  1  &  2 

Nos.  1  &  2 

$  28.00 

$  30.00 

2  " 

No.  5 

No.  3 

No.  3 

Nos.  3  &  4 

No.  3 

No.  3 

36.00 

38.00 

2*  " 

No.  8 

No.  4 

No.  4 

Nos.  5&6 

Nos.  4  &  5 

Nos.  4  &  5 

45.00 

47.00 

2f  » 

No.  8i 

No.  5 

No.  5 

No.  7 

No.  6 

Nos.  6  &  7 

53.00 

55.00 

3  " 

No.  10 

No.  6 

No.  6 

No.  8 

No.  7 

No.  8 

65.00 

67.00 

3i  " 

No.  12 

No.  7 

No.  7 

No.  9 

No.  8 

No,  9 

78.00 

80.00 

4  " 

No.  15 

No.  8 

No.  10 

No.  10 

90.00 

93.00 

4£  « 

No.  18 

No.  8 

No.  11 

No.  9 

No.  11 

140.00 

145.00 

5*  " 

No.  22 

No.  9 

No.  12 

No.  10 

No.  12 

180.00 

185.00 

ROCHESTER,  N.  Y.,  AND  NEW   YORK  CITY. 


29 


CONDENSING  LENSES. 

These  lenses  we  make  of  the  very  highest  grade  and  of  strong  curvature  so 
as  to  give  the  greatest  concentration  of  light.  They  should  not  be  confounded 
with  plano-convex  lenses  of  weak  curvature  and  therefore  of  insufficient  concen- 
trating capacity. 


Price, 

Price, 
In  Brass  Mounting. 

Telegraphic 
Code. 

No. 

Diameter. 

Focus. 

Unmounted. 

H 

U  in. 

2  in. 

$  1.50  each. 

%  4.50  per  pair. 

Obal. 

2*  " 

2f  " 

1.75  " 

5.00  " 

Oboth. 

3 

3  " 

3i  " 

2.00  " 

6.00  " 

Ochill. 

3£ 

4i  " 

2.25  y\ 

7.00  " 

Ocina. 

4 

4  " 

5  " 

2.50  V 

8.00  " 

Oded. 

4£ 

4i  " 

5*  " 

3.00  " 

10.00  " 

Olamus. 

5 

5  " 

6*  k' 

3.75  " 

11.50 

Oman. 

6 

6  " 

7i  " 

6.00  <l 

17.00 

Onias. 

7 

7  " 

9  " 

10.00  " 

25.00  " 

Ono. 

8 

8  «' 

10  " 

15.00  " 

36.00  " 

Oreb. 

9 

9 

11  " 

20.00  " 

46.00 

Oseas. 

10 

10  " 

12  " 

25.00  " 

60.00 

Ozen. 

12 

12  " 

14  " 

38.00  " 

95.00 

Ozoran. 

13 

13  " 

18  " 

50.00  «' 

120.00  " 

Ozone. 

FINDER  LENSES. 

These  lenses  are  of  first  quality  and  are  furnished  either  double  or  piano 
convex,  with  edges  ground  or  unground. 


No. 

Diameter. 

Focus. 

Price 
with  Edges 
Unground. 

Price 
with  Edges 
Ground. 

Telegraphic 
Code. 

1 

i  in. 

I  to  2  in. 

$0.40  each. 

$0.60  each. 

Idnel. 

2 

t  " 

f  to  2  " 

.40  " 

.60  " 

Igal. 

3 

i  " 

1    to  2  " 

.40  " 

.60  " 

Ivam. 

4 

U  to  3  " 

.40  " 

.60  " 

Ishod. 

5 

t  " 

1|  to  3  " 

.50  " 

.70  *« 

Ithai. 

6 

2    to  3*  " 

.50  " 

.70  " 

I  rah. 

7 

1  *• 

2    to  4  " 

.50  " 

.70  " 

Isui. 

BAUSCH  &  LOMB  OPTICAL  COMPANY, 


FOCUSING  AND  RETOUCHING-  GLASSES. 


No.  144.  No.  50.  No.  152. 


No. 

DESCRIPTION. 

Price. 

Telegraphic 
Code. 

50 

Rubber  Case,                          size  of  glass,    £  inch  diameter, 

.30 

Raamah. 

56 

Rubber  Case,  same  as  No.  50,  size  of  glass,  1   inch  diameter, 

.40 

Rabbah. 

62 

.60 

Rabboni. 

68 

.70 

Raca. 

74 

it  " 

.90 

Ragan. 

78 

2  " 

1.15 

Ragnel. 

144 

Watchmaker  Glasses,  assorted,  (three  sizes  and  different  focus), 

.40 

Raftan. 

144 

L.  P.,  Watchmaker  Glasses,  with  springs,  (three  sizes,  different  focus), 

.60 

Rakem. 

152 

Rubber  Frame;                                size  of  glass,  1   inch  diameter, 

.60 

Ramesis. 

153 

1±  " 

.80 

Ramoth. 

154 

If  " 

1.00 

Ramiah. 

155 

2  " 

1.50 

Raphu. 

156 

n  u 

2.00 

Reba. 

157 

2|  '*> 

2.50 

Rechab. 

252 

Metal  Frame,  Black  Enameled  Handle;        "         2  " 

.80 

Rehum. 

253 

2i  " 

.90 

Resen. 

254 

H  " 

1.00 

Rezia. 

255 

2f  » 

1.25 

Rhoda. 

256 

"              ■                                "3  " 

1.50 

Ribai. 

257 

Si  " 

1.75 

Rufus. 

258 

3£  " 

2.00 

Ruma. 

259 

3f  " 

2.25 

Runen. 

260 

4  " 

2.50 

Ruoti. 

261 

3.25 

Ruti. 

262 

5  " 

4.00 

Ruvo. 

263 

5i  " 

5.00 

Rys. 

264 

6  " 

6.00 

Ryssen. 

ROCHESTER,  N.  Y.,   AND  NEW  YORK  CITY. 


31 


FLANGES,  LEATHER  CAPS,  AND  CASES. 

BRASS  FLANGES. 


No. 

1 

2 

3          Jf          5          6  7. 

8 

9 

Diam. 
Price,  ! 

H 
$-.50 

2 

-.75 

2£         3          3£         4  5 
1.00      1.25      1.50      1.75  2.00 

H 

2.50 

6 

3.00 

inches, 
each. 

No. 

1 

2 

ALUMINUM  FLANGES. 

3          4           5           6  7 

8 

9 

Diam. 
Price,  ! 

H 

11.00 

2 
1.25 

2|         3          3|         4  5 
1.50      2.00      2.50      3.00  3.50 

H 
4.00 

6 

4.50 

inches, 
each. 

MOROCCO  LEATHER  CAPS, 

For  Universal,  Clark,  and  Zeiss  Lenses. 

No.    1      2     3      4        5      6     7       8        9      10      11  12 

Diam.  H  If  H  2TV>  2A,  H  «  3tV,  3tV,  4tV,  4tV,  5*  inches. 
Price,  $.60  -.60  -.65  -.70   -.70  -.75  -.80  -.90   1.00    1.10    1.20   1.25  each. 


MOROCCO  LEATHER  DIAPHRAGM  CASES, 

For  Universal,  Clarlc,  and  Zeiss  Lenses. 

No.    1       2        3        4        5       6         7  8        9       10     11  12 

Size  ifxli,  l^xlf,  lfWi  lx\x24V,  Hx2i,  lfx2i,  lTfx2f ,  2T\x3TV,  2Jx3A,  3x4£,  3x\x4|(  4x5^  in. 
$-.75   -.75    -.80    -.85     -.85  -.90   -.95     1.00     1.15   1.30  1.50  1.75  ea. 

LEATHER    CAPS    For  Yelox  Lenses. 

No.     1        2        3         4        5        6         7         8         9  10 
Diam.    If,      H,      2TV,      %5      2f,      3,       3^,     3T%,  5f  inches. 

Price,  $-.40   -.45    -.50     -.55     -.60   -.65     -.70     -.80     -.90    1.00  each. 

LEATHER  DIAPHRAGM  CASES 

For  Velox  Lenses. 

No.      12  3  4  5  6  7  8 

Size,  lTVxlf,  lix2i,  lfx2J,  2TVx2Tf,  2^x3^,  2fx3f,  3T\x4|,  4x5^  inches. 
Price,  $-.60      -.65       -.70        -.80        -.90       1.00       1.25       1.50  each. 

WATERHOUSE  STOPS 

(Exclusive  of  Leather  Case). 

Size,      4x5,    5x8,    6|x8|,   8x10,    10x12,   11x14,    12x15    14x17   16x20  20x24 


Per  set,  $-.75  1.00     1.25      1.50     1.75       2.00     2.25      2.50     2.75  3.00 


3- 


BAUSCH  &  LOMB   OPTICAL  COMPANY. 


Table  for  Finding  the  Minimum  Length  of  Studio  for  a  Given  Lens. 

(From  the  American  Amqteur  Photographer.) 
DISTANCES  IN  INCHES  FROM  OBJECT  TO  LENS. 


Equivalent 
Focus  of  Lens. 

3  in. 
high. 

4  in. 
high. 

5  in. 
high. 

6  in 
high. 

8  in. 
high. 

io  in. 
high. 

i2  in. 
high. 


16  in 
high. 

20  in 
high. 

24  in 
high. 

30  in 
high. 

36  in 
high. 

48  in 
high. 

. 

54  in. 
high. 

60  in 
high. 

high. 

3  inches  

75 

57 

4  " 

100 

76 

61* 

52 

5  " 

125 

95 

77 

65 

50 

6   . 

150 

1  1  A 

114 

92f 

to 

60 

A  ft  1 

49  i 

8  " 

200 

152 

1231 

104 

80 

65T% 

56 

10  " 

250 

190 

154 

130 

100 

82 

70 

55 

12  " 

300 

228 

184* 

156 

120 

98 1 

84 

66 

551 

16  " 

400 

304 

246f 

208 

161 

1311 

112 

88 

72f 

64 

54* 

48 

20  " 

500 

380 

308 

260 

200 

164 

140 

110 

90| 

80 

68 

60 

50 

46* 

24  " 

600 

456 

369f 

312 

240 

196f 

168 

132 

HOf 

96 

81* 

72 

60 

56 

521 

48 

30  " 

750 

540 

462 

390 

300 

246 

210 

165 

1361 

120 

102 

90 

75 

70 

65 

60 

36  " 

900 

684 

554| 

463 

360 

3071 

252 

198 

165f 

144 

122* 

108 

90 

84 

791 

72 

48  " 

1200 

912 

7391 

624 

480 

3931 

336 

264 

2201 

192 

1631 

144 

120 

112 

105* 

96 

60  " 

1500 

1080 

1024 

780 

600 

492 

420 

330 

2721 

240 

204 

180 

150 

140 

132 

120 

72  "   

1800 

1368 

1108f 

936 

720 

614 1 

504 

396 

3211 

288 

2441 

216 

180 

168 

158* 

144 

DISTANCES  IN  INCHES  FROM  LENS  TO  GROUND-GLASS. 


Equivalent 
Focus  of  Lens. 

3  in- 
high. 

4  in. 
high. 

5  in. 
high. 

6  in. 
high. 

8  in. 
high. 

10  in. 
high. 

12  in. 
high. 

16  in. 
high. 

20  in. 
high. 

24  in. 
high. 

30  in. 
high. 

36  in. 
high. 

48  in. 

high. 

54  in. 
high. 

60  in. 
high. 

72  in. 
high. 

3  inches   

31 

4  " 

41 

4f 

*18 

41 

5  " 

K  5 

5t5f 

5ff 

BA 

5| 

6  " 

2* 

6£ 

6fV 

61 

6* 

71 

8  " 

81 

8f 

8* 

8* 

n 

91 

10  " 

10A 

10 1 

10** 

10  f 

Hi 

1H 

12* 

12  " 

12  i 

12 1 

12* 

13 

131 

13* 

14 

14* 

151 

16  " 

16* 

16  | 

in 

17* 

m 

18  1 

18* 

19* 

201 

211 

22* 

24 

20  " 

20  f 

21i 

21T78 

21* 

22f 

221 

231 

24* 

26* 

281 

30 

33* 

35 

24  " 

25 

251 

25  f 

26 

26* 

26* 

28 

291 

30* 

32 

34 

36 

40 

42 

44 

48 

30  " 

31  i 

31* 

32TV 

321 

33* 

34? 

35 

36* 

381 

40 

42^ 

45 

50 

521 

55 

60 

36  " 

37  i 

38 

381 

39 

39* 

40 

42 

44 

46 

48 

51 

54 

60 

63 

66 

72 

48  " 

50 

50* 

511 

52 

531 

54  * 

56 

58* 

611 

64 

68 

72 

80 

84 

88 

96 

60  " 

62  i 

631 

641 

65 

66* 

681 

70 

731 

77* 

80 

85 

90 

100 

105 

110 

120 

72  "   

75 

76 

77 

78 

791 

80 

84 

88 

92 

96 

102 

108 

120 

126 

132 

144 

Suppose  the  lens  used  is  24  in.  equiv.  focus,  and  you  wish  to  make  a  full-length  portrait  of  a  man 
six  feet  high,  in  which  the  image  will  be  six  inches  high.  Look  at  the  left-hand  column  for  lens  focus, 
and  in  the  top  line  for  size  of  image.  At  the  intersection  of  these  columns  we  find  312  inches  =  26 
feet,  to  be  the  distance  the  person  must  stand  from  the  lens.  In  the  next  table,  using  the  same  lens 
and  size  of  image  as  before,  at  the  intersection  of  the  columns  we  find  twenty-six  inches,  which  repre- 
sents the  distance  of  the  ground  glass  from  lens  center.  And  in  the  same  way  any  lens  and  size  of 
image  may  be  computed  for. 

Table  of  View  Angles. 


DIVIDE  THE  BASE  OF  THE  PLATE  BY  THE  EQUIVALENT  FOCUS  OF  THE  LENS, 


If  the 

The 

If  the 

The 

If  the 

The 

If  the 

The 

If  the 

The 

If  the 

The 

quotient 

angle 

quotient 

angle 
is 

quotient 

angle 

quotient 

angle 

quotient 

angle 
is 

quotient 

angle 

is 

is 

is 

is 

is 

is 

is 

is 

is 

is 

Deg. 

Deg. 

Deg-. 
42 

1.041 

Deg. 

1.36 

Deg. 

Deg. 

.282 

16 

.517 

29 

.768 

55 

68 

1.7 

81 

.3 

17 

.536 

30 

.788 

43 

1.063 

56 

1.375 

69 

1.739 

82 

.317 

18 

.555 

31 

.808 

44 

1.086 

57 

1.4 

1° 

1.769 

83 

.335 

19 

.573 

32 

.828 

45 

1.108 

58 

1.427 

1.8 

84 

.353 

20 

.592 

33 

.849 

46 

1.132 

59 

1.45 

72 

1.833 

85 

.37 
.389 

21 

.611 

34 

.87 

47 

1.155 

60 

1.48 

73 

1.865 

86 

22 

.631 

35 

.89 

48 

1.178 

61 

1.5 

74 

.898 

87 

.407 

23 

.65 

36 

.911 

49 

1.2 

62 

1.53 

75 

1.931 

88 

.425 

24 

.67 

37 

.933 

50 

1.225 

63 

1.56 

76 

1.965 

89 

.443 

25 

.689 

38 

.954 

51 

1.25 

64 

1.59 

77 

2. 

90 

.462 

26 

.708 

39 

.975 

52 

1.274 

65 

1.62 

78 

.48 

27 

.728 

40 

1. 

53 

1.3 

66 

1.649 

79 

.5 

28 

.748 

41 

1.02 

54 

1.32 

67 

1.678 

80 

This  table  has  been  calculated  by  Dr.  Woodman  for  the  use  of  those  who  wish  to  know  the  precise  angle  of  view 
included  by  any  particular  lens  on  a  given  size  of  plate.    Its  mode  of  use  will  be  easily  seen  by  inspection. 


WORKS  OF  BAUSCH  &  LOMB  OPTICAL  CO.    ROCHESTER  N.  Y. 

FRONT  VIEW  — FACING  NORTH  ST.  PAUL  ST 


WORKS  OF  BAUSCH  &  LOMB  OPTICAL  CO.,  ROCHESTER,  N.  Y. 

REAR  VIEW  — ON  THE  BANK  OF  THE  GENESEE  RIVER. 


